﻿// Copyright (c) Matthias Koch
//
// See the NOTICE file distributed with this work for additional information
// regarding copyright ownership.  rubicon licenses this file to you under 
// the Apache License, Version 2.0 (the "License"); you may not use this 
// file except in compliance with the License.  You may obtain a copy of the 
// License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the 
// License for the specific language governing permissions and limitations
// under the License.
// 
using System;
using System.Collections;
using System.Linq;

using XValidation.Exceptions;

namespace XValidation.Validations
{
  public class HasValidation : IValidation
  {
    private readonly IValidation _validation;

    public HasValidation (IValidation validation)
    {
      _validation = validation;
    }

    public virtual void Validate (object value, string paramName, IValidationContext context)
    {
      if (value is IEnumerable)
        Validate ((IEnumerable) value, paramName, context);
      else
      {
        throw new IncompatibleTypeException (typeof (IEnumerable), paramName);
      }
    }

    private void Validate (IEnumerable value, string paramName, IValidationContext context)
    {
      var enumerator = value.GetEnumerator();
      while (enumerator.MoveNext ())
      {
        try
        {
          _validation.Validate (enumerator.Current, paramName, context);
          return;
        }
        catch (ValidationException)
        {
        }
      }

      throw new HasValidationException (_validation, paramName);
    }
  }
}